David Crook (14 August 1910 – 1 November 2000) was a British-born Communist ideologue, activist and spy, long resident in China. A committed Marxist from 1931, he joined the International Brigades during the Spanish Civil War (1936–1939), then was recruited by the NKVD, the Soviet secret police, and was sent to China during the Second Sino-Japanese War (1937–1945). There he met and married his wife, Isabel, a teacher and social activist. Following the Second World War and the Chinese Civil War, the couple stayed in China and taught English.